Frankly, I had My doubts that Mozilla ever wanted to release a 64bit browser, as the browser never left Alpha or Nightly status, this only confirms, those like Me have been abandoned, I like My 64bit browser, My favorite version is 12.0a1, the latest version 20.0a1 is not worth running, nor is 13.0a1 to 19.0a1 as there are few things that were never fixed that should have been, 12.0a1 is the best and the most stable 64bit browser I've ever seen, You might need at least 8GB of ram, but it does work, I have 16GB of ram, could 12.0a1 have been released? Yes, I've used it for over 1 year, It works with quite a few extensions, Mozilla just has COLD Feet...

So instead Mozilla wants everyone to go back to cramped 32bit-dumb...

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Development of 64-bit Firefox for Windows is dead. As hard to believe in this 64-bit world, it seems that 32-bit apps still rule. On Friday, Mozilla engineering manager Benjamin Smedberg posted a thread over on the Google Groups mozilla.dev.planning forum called "Turning off win64 builds", due to various problems with them. After a somewhat lively discussion, he decided to pull all 64-bit development on Wednesday, meaning that a 64-bit version of Firefox will unfortunately never be released.Firefox 64-Bit Development for Windows Killed Off
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An easy way to tell if one has a 64bit XP, Vista or Win7 OS or not is to look for "*32"(minus the quote marks that is) after a file name in Windows Task Manager, if You don't see *32 anywhere You may have a 32bit OS, like after ones Seti app, in which case You can't run a 64bit program, even if You tried.
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It does. Someone made a nice document for Windows 8 keyboard shortcuts in PDF & XPS format. Most of the keyboard shortcuts are the same ones that have always been around, but there are some newer ones for Windows 8 & some I forget about when using Windows 7.
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Its a 64bit recompile of the latest Mozilla code....you
can read about it at the web site. I've used it for about
a year and a half with no problems....

But I just tried Palemoon 15.3 x64 and I like it better, it's now My default browser and all 4 of My plugins and extensions work fine and there is a tool that will migrate ones Firefox profile to Palemoon, I used it, it's like I've always been running it and all My extensions are up to date too, so I'm sold.